<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS介绍</title>
</head>
<body>
<table border="1px" width="500px">
    <tr>
        <td>100</td>
        <td>100</td>
        <td>100</td>
    </tr>
    <tr >
        <td>200</td>
        <td>200</td>
        <td>200</td>
    </tr>
    <tr>
        <td>300</td>
        <td>300</td>
        <td>300</td>
    </tr>
</table>

</body>
</html>